Claude Code Memory: How It Actually Works (and How to Make It Persistent)

Ask ten developers what Claude Code remembers and you will get ten different answers. Some think it remembers everything. Some think it remembers nothing. The truth is in the middle, and it matters, because how you work with the tool changes completely once you understand which kind of memory you are dealing with.

This is the full picture: what Claude Code remembers natively, what it quietly forgets, and how to make its memory persistent so Friday's context is still there on Monday.

What Claude Code remembers natively

Claude Code has three kinds of memory built in. They are useful, and they are all narrower than they sound.

1. CLAUDE.md: your project memory

CLAUDE.md is a markdown file you keep in your project (and optionally a global one in your home directory). Claude Code reads it at the start of every session. This is where you put the durable stuff: architecture notes, conventions, commands to run, things you always have to correct.

This is real, persistent memory, but it is static. It remembers what you wrote in it, nothing more. It does not update itself, it does not remember what happened last session, and it has no idea what you decided on Tuesday. Think of it as a very good README that the agent always reads, not as a brain.

2. Session memory: the conversation itself

Within a session, Claude Code remembers everything in the conversation: what you asked, what it tried, what failed, the decisions you made together. This is the working memory, and it is excellent while it lasts.

The catch is "while it lasts." This memory lives and dies with the session.

3. Compaction: memory under pressure

When a session's context fills up, Claude Code compacts: it summarizes the conversation so far and continues from the summary. This is genuinely clever engineering. It is also lossy by design.

A summary keeps the shape of what happened and drops the details. The exact error message, the subtle reason you rejected an approach, the constraint you mentioned in passing, these are the first things to go. After two or three compactions, the agent is working from a summary of a summary. It still sounds confident. It is working with a faded photocopy of the original context.

What Claude Code forgets

Now the other side of the ledger, the part nobody puts in the marketing:

• /clear wipes the session. Type /clear (or just close the terminal) and the conversation memory is gone. CLAUDE.md survives, everything else does not.
• Nothing crosses sessions. Monday's session has never met Friday's session. The decisions, the dead ends, the half-finished refactor, all of it has to be re-explained.
• Nothing crosses devices. What you did on your laptop does not exist on your phone or your other machine.
• Compaction decays details. The longer a task runs, the more the agent is reasoning from summaries instead of the real thing.

None of this is a bug. Claude Code is a stateless agent by design: each session starts from your files plus your prompts. But it means the single most expensive part of using the tool is the part nobody benchmarks: the twenty minutes at the start of every session where you re-teach a brilliant agent everything it used to know.

Making Claude Code memory persistent

The fix is to give the agent a memory that lives outside any single session. Not a bigger context window, not a longer summary, but a durable store the agent can read at the start of a session and write to as it works.

That is what Vilix AI is: a shared memory and work-state layer that connects to Claude Code over MCP, tied to one account.

The setup is straightforward. Connect Claude Code to your Vilix AI account over MCP and enable the memory tools. Then the workflow looks like this:

• Session start: the agent calls get_context and loads the relevant saved context. Your project state, your standing rules, where you left off, what you decided. Retrieval is semantic, so it finds what you meant, not just what you typed, and it is recency-aware, so the newest version is what the agent sees. It pulls what is relevant instead of dumping the whole archive.
• During the session: the agent calls save_turn to save the exchange. Full conversation history, not just extracted facts, plus derived memories, tasks, and project rules. Friday's debugging session is still there on Monday, in full, not as a faded summary.
• Across tools and devices: the same memory is shared across every client connected to your account. Connect Codex, Cursor, OpenClaw, Hermes, or ChatGPT to the same Vilix AI account (each client needs its own connection; one approval does not configure the others) and they all read the same memory. Plan in Claude, build in Codex, check in from your phone. Correct something once and it is corrected everywhere. If two tools ever save conflicting info, the most recent save wins, so the newest truth is always what the AI sees.

One thing to know going in: connecting a client does not import its old chat history. Memory starts building from the moment you connect. And be aware of a quirk of MCP itself, not of any one product: the model decides when to call the memory tools, and models can be lazy about it. If the agent ever seems to start cold, nudge it with "check Vilix AI for context first." Then it works.

Why this is worth the five-minute setup

Vilix AI is cloud-hosted, so there is nothing to install and no infrastructure to manage. It stores your full conversation history, so you can revisit the actual conversation any time instead of trusting a summary. Your data is portable: export everything or delete individual memories (or the whole account) whenever you want, instantly. There is a free plan, and a 7-day Pro trial with no credit card required.

Claude Code's native memory, CLAUDE.md plus session context plus compaction, is good design for a stateless agent. But stateless is a choice, not a law. Give the agent a memory that persists and the Friday-to-Monday problem disappears: every session starts smart, on every device, in every tool.

Start here: https://vilix.ai?utm_source=devto&utm_medium=article&utm_campaign=claude-code-memory

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How do you handle Claude Code memory today? Genuinely curious what workflows people have built around the session boundary. And if you try the persistent route, the free plan plus the 7-day Pro trial (no credit card) is the way to test it: https://vilix.ai?utm_source=devto&utm_medium=article&utm_campaign=claude-code-memory